Candela per square metre
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- "Nit (unit)" redirects here. For other uses, see Nit.
The candela per square metre (cd/m²) is the SI unit of luminance; nit is a non-SI name also used for this unit. It is often used to quote the brightness of computer displays, which typically have luminances of 50 to 300 nits (the sRGB spec for monitors targets 80 nits). Modern flat-panel (LCD and plasma) displays often exceed 300 cd/m² or 300 nits.
The term is believed to come from the Latin "nitere" = to shine.
[edit] References
- IEC 61966-2-1:1999 is the official specification of sRGB.
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| Quantity | Symbol | SI unit | Abbr. | Notes |
|---|---|---|---|---|
| Luminous energy | Qv | lumen second | lm·s | units are sometimes called talbots |
| Luminous flux | F | lumen (= cd·sr) | lm | also called luminous power |
| Luminous intensity | Iv | candela (= lm/sr) | cd | an SI base unit |
| Luminance | Lv | candela per square metre | cd/m2 | units are sometimes called nits |
| Illuminance | Ev | lux (= lm/m2) | lx | Used for light incident on a surface |
| Luminous emittance | Mv | lux (= lm/m2) | lx | Used for light emitted from a surface |
| Luminous efficacy | lumen per watt | lm/W | ratio of luminous flux to radiant flux; maximum possible is 683.002 |
